Lathe



May 17, 1932.

. LATHE Filed Dec. 10, 1930 17 J12 denier:

Karl Tssky &y e -g fi'hy.

K. TESSKY 1,858,154 I Patented May 17', 1932 PATENT OFFICE KARL TESSKY, OF ESSLINGEN-ON-THE-NECKAR, GERMANY LATHE Application filed December 10, 1930, Serial No. 501,370, and in- Germany December 20, 1929.

My invention relates to lathes and more particularly to lathes having rocking tool holder arms. Such rockers are old in lathes and particularly in automatic lathes in which the several tools are moved into operative relation to the work by rocking them. Heretofore, as a rule, only three rockers could be provided, for if more had been arranged, they wouldhave interfered or-the tools would not have been accessible to a sufficient extent. In many cases, however, it is desirable to have a further tool, or further tools available for certain operations, and such tool, or tools should also be supported by a rocker.

According to my invention this is effected in a manner which is not disadvantageous either with respect to the action of the tools or with respect to the accessibility of the parts. To this end the rocker for the additional tool is mounted to rock about the axis of one of the other rockers, which are arranged in the usual manner.

In the drawings aflixed to this specification and-forming part thereof a lathe em bodying my invention is illustrated diagrammatically by way of example. In the drawings Fig. 1 is an end elevation of the rockers viewed in the axial direction of the work,

Fig. 2 is an elevation showing a portion of the lathe, partly in section on the line IIII in Fig. 1, i

Fig. 3-is a section on the line IIIIII, and Fig. 4 is a section on theline IV-IV in Fig. 2,

Fig. 5 is a section showing only the upper portion of Fig. 2, with a diflerent adjustment of parts, Fig. 6 is a section on'the line VI -VI in Fig. 2, drawn to a larger scale, and V Fig. 7 is a section on the line VII-VII.in

Fig 6. v

eferring to the drawings and first to Figs.

1, 4, 5 and Gare three lever-like tool holder arms or rockers, 1, 2 and 3 are the tools chucked in the respective rockers, and-7, 8 and 9 are the shafts of the re ers.

According to my invention I 5 additional tool 11 inan addit ona rocker 12 rovide an mounted to rock about the axis of theshaft 9. The rockeris adapted to be shifted with, and may be detachably mounted on, the shaft 9.

Fig. 2 shows the rocker 12 secured on'the shaft 9. In order to impart movement to the rocker the shaft 9 is rotated by a toothed sector 13 on the shaft and a corresponding sector on a lever 15. The lever 15 is equipped with a roller at its free end and cooperates with a cam 16 on a control shaft 17 in the usual manner. 18 is the boss or hollow shaft of the rocker 6 which serves as a bearing for the shaft 9 and is held in a bearing block 19 against axial displacement. The boss 18 is equipped with a toothed sector 20 which 'isengaged by a sector 21 on a lever 22 cooperating with a cam 23.

By the cooperation of the cams 16 and 23 with the respective levers 15 and 22 the rockers 12 and 6 are operated so as to present the tools 11 and 3 to the work 10, as required.

If, for instance, the tool 11 on the rocker 12 is a normal cutter which moves along the axis of the work, and the tool 3 is. a cutting-off tool, provision for displacing the tool 11 is'made by mounting the shaft 9 to slide in the boss 18 of the rocker 6. To this end a neck collet 24 is fitted on the shaft 9 on which acts one end of a double-armed lever 26 mounted to rock about a fixed pin,

able'and seated on a pin 29 at the end of the shaft 9 opposite the rocker 12. This check may be part of a reversible sleeve 30, so that when the sleeve is reversed as shown in Fig. 5 the shaft 9 and its rocker 12 areheld against axial displacement, but the shaft 9 is still free to rotate in the boss 18. In this position of the shaft 9' the lever 26 is beyond reach of the cam 27.

As will appear from- Figs. 2 and 5 onlycomparatively little space is available for the rocker 12 with the tool 11, intermediate therocker 6 and its tool 3, and the normally present other tools which act on the work ablyarranged in a suitable depression of the rocker 12, so that its outer face is flush with the side of the rocker 12. Preferably the thread of the pin is cut away at certain points, in the present instance at two diametrically opposite points, foran angle of 90 dogs, in order to facilitate rapid insertion and removing of tool holder 32 and pin 35. hen the chuck and the pin have been assembled by means of the unthreaded portions of thepin, only a partial rotation is re quircd; for engaging the threads and for clamping the parts, and similarly only apartial rotation in the opposite direction is supplied for disengaging the threads whereupon the tool holder 32 may be extracted in axial direction.

The tool-holding means in the tool holder 32 may be designed as desired. By way of example a set screw 37 is shown in 'Fig. 7

Preferably the tool holder 32 is so arranged that itmay be adjusted in the rocker l2 by rotating it. To this end it is equipped with two shoulders 38'and 39 with which cooperate set screws 40 and 4-1 in threaded v holes of the rocker 12. The shoulders and screws must be soarranged that by setting one of the screws torque is exerted in opposite direction to the torque exerted by the other screw.

The means for moving the rocker 12 may be varied without departing from my invention. My invention may also be applied to machine tools in which not all the tools on the rockers are cutting tools. For instance, one of the rockers mightbe equipped with a check for the work. or with a gripper for moving a partly tooled blank to another station, for instance, when it is desired to saw a slot in the. head of a screw, to drill one or more holes, to tap anut which has been bored and trimmed off, etc.

By the described combination of two rockers 6 and 12fto move about the axis of the same shaft 9 which obviously might also be provided for the shafts 7 and 8 of the rockers 4 and 5, as required by the shape of the work, or by the number of tools, I obtain a very compact arrangement of several tool holders and their tools without interference of the tools with each other and without detracting from their accessibility and ready adjustability.

I wish it to be understood that I do not desire to belimited tothe exact details of reserved.

I claim:

1. A lathe comprising rocking tool holder arms, and a' hollow shaft on one of said holder arms, another holder arm mounted in said hollow shaft for rotation, one of. said two holder arms being arranged to be rocked only,

.while the other is arranged to be rocked and displaced. a

2. A lathe comprising rocking tool holder arms, a hollow shaft on one of said holder arms, another holder arm mounted in said hollow shaft for rotation, and displacement, and a check adapted to be connected to said shaft in two positions so that the shaft is free to be displaced within limits in one position of the check, and is held against displacement in its other position.

3. A lathe comprising rocking tool-holder arms, a hollow shaft on one of said holder arms, another holder arm mounted in said hollow shaft for rotation, one of said toolholder arms being arranged to be rocked only,

while the other arm is arranged to be rocked and displaced, a tool holder in a bore of said tool holder arm which is arranged for rocking movement and displacement, the bore extending in parallel to the axis about which it rocks, means for securing said holder in the bore of said arm, *interengaging threads in said tool holder and on saidvtool-holder securing means, said threads being cut away for part of the inner and outer perimeters of said tool holder and said securing means, respectively, and two set screws in said toolholder arms arranged at both sides of the axis of said tool holder for rotating it in opposite directions.

In testimony whereof I afiix my signature.

KARL TESSKY. 

